diff --git a/code/network/multi_interpolate.cpp b/code/network/multi_interpolate.cpp
index fd9cd2949aa..537dd43e9ab 100644
--- a/code/network/multi_interpolate.cpp
+++ b/code/network/multi_interpolate.cpp
@@ -165,8 +165,10 @@ void interpolation_manager::interpolate_main(vec3d* pos, matrix* ori, physics_in
 // correct the ship record for player ships when an up to date packet comes in.
 void interpolation_manager::reinterpolate_previous(TIMESTAMP stamp, int prev_packet_index, int next_packet_index,  vec3d& position, matrix& orientation, vec3d& velocity, vec3d& rotational_velocity)
 {
-	// calc what the timing was previously.
-	float numerator = static_cast<float>(stamp.value()) - static_cast<float>(_packets[prev_packet_index].remote_missiontime);
+	// calc what the timing was previously.  The caller hands us an absolute timestamp, 
+	// but remote_missiontime is relative to mission start, so drop the start time before comparing.
+	float local_time = static_cast<float>(stamp.value() - Multi_Timing_Info.get_mission_start_time());
+	float numerator = local_time - static_cast<float>(_packets[prev_packet_index].remote_missiontime);
 	float denominator = static_cast<float>(_packets[next_packet_index].remote_missiontime) - static_cast<float>(_packets[prev_packet_index].remote_missiontime);
 
 	denominator = (denominator > 0.05f) ? denominator : 0.05f;
diff --git a/code/network/multi_obj.cpp b/code/network/multi_obj.cpp
index 760b31af85b..10306310f83 100644
--- a/code/network/multi_obj.cpp
+++ b/code/network/multi_obj.cpp
@@ -1223,6 +1223,17 @@ int multi_oo_pack_client_data(ubyte *data, ship* shipp)
 	return packet_size;
 }
 
+// vm_extract_angles_matrix_alternate returns angles in the range -PI..PI, but the subsystem list packer
+// encodes them as an unsigned fraction of a full rotation, so wrap negatives around before sending.
+static float multi_oo_normalized_angle(float angle)
+{
+	if (angle < 0.0f) {
+		angle += PI2;
+	}
+
+	return angle / PI2;
+}
+
 // pack the appropriate info into the data
 #define PACK_PERCENT(v) { std::uint8_t upercent; if(v < 0.0f){v = 0.0f;} upercent = (v * 255.0f) <= 255.0f ? (std::uint8_t)(v * 255.0f) : (std::uint8_t)255; memcpy(data + packet_size + header_bytes, &upercent, sizeof(std::uint8_t)); packet_size++; }
 #define PACK_BYTE(v) { memcpy( data + packet_size + header_bytes, &v, 1 ); packet_size += 1; }
@@ -1411,32 +1422,32 @@ int multi_oo_pack_data(net_player *pl, object *objp, ushort oo_flags, ubyte *dat
 				// here we're checking to see if the subsystems rotated enough to send.
 				if (angs_1 != nullptr && angs_1->b != Oo_info.player_frame_info[pl->player_id].last_sent[objp->net_signature].subsystem_1b[i]) {
 					flags[i] |= OO_SUBSYS_ROTATION_1b;
-					subsys_data.push_back(angs_1->b / PI2);
+					subsys_data.push_back(multi_oo_normalized_angle(angs_1->b));
 				}
 
 				if (angs_1 != nullptr && angs_1->h != Oo_info.player_frame_info[pl->player_id].last_sent[objp->net_signature].subsystem_1h[i]) {
 					flags[i] |= OO_SUBSYS_ROTATION_1h;
-					subsys_data.push_back(angs_1->h / PI2);
+					subsys_data.push_back(multi_oo_normalized_angle(angs_1->h));
 				}
 
 				if (angs_1 != nullptr && angs_1->p != Oo_info.player_frame_info[pl->player_id].last_sent[objp->net_signature].subsystem_1p[i]) {
 					flags[i] |= OO_SUBSYS_ROTATION_1p;
-					subsys_data.push_back(angs_1->p / PI2);
+					subsys_data.push_back(multi_oo_normalized_angle(angs_1->p));
 				}
 
 				if (angs_2 != nullptr && angs_2->b != Oo_info.player_frame_info[pl->player_id].last_sent[objp->net_signature].subsystem_2b[i]) {
 					flags[i] |= OO_SUBSYS_ROTATION_2b;
-					subsys_data.push_back(angs_2->b / PI2);
+					subsys_data.push_back(multi_oo_normalized_angle(angs_2->b));
 				}
 
 				if (angs_2 != nullptr && angs_2->h != Oo_info.player_frame_info[pl->player_id].last_sent[objp->net_signature].subsystem_2h[i]) {
 					flags[i] |= OO_SUBSYS_ROTATION_2h;
-					subsys_data.push_back(angs_2->h / PI2);
+					subsys_data.push_back(multi_oo_normalized_angle(angs_2->h));
 				}
 
 				if (angs_2 != nullptr && angs_2->p != Oo_info.player_frame_info[pl->player_id].last_sent[objp->net_signature].subsystem_2p[i]) {
 					flags[i] |= OO_SUBSYS_ROTATION_2p;
-					subsys_data.push_back(angs_2->p / PI2);
+					subsys_data.push_back(multi_oo_normalized_angle(angs_2->p));
 				}
 
 				// clang says deleting null pointer has no effect
@@ -1600,8 +1611,8 @@ int multi_oo_unpack_client_data(net_player* pl, ubyte* data, bool keep_data)
 
 	int offset = 0;
 
-	// read flag info
-	ushort in_flags;
+	// read flag info -- this is packed as a single byte, so it must be read back as one
+	ubyte in_flags;
 	memcpy(&in_flags, data, sizeof(ubyte));
 	offset++;
 
@@ -1895,7 +1906,7 @@ int multi_oo_unpack_data(net_player* pl, ubyte* data, int seq_num, int time_delt
 			full_physics = true;
 		}
 
-		int r5 = multi_pack_unpack_desired_vel_and_desired_rotvel(0, full_physics, data + offset, &pobjp->phys_info, &local_desired_vel);
+		int r5 = multi_pack_unpack_desired_vel_and_desired_rotvel(0, full_physics, data + offset, &new_phys_info, &local_desired_vel);
 		offset += r5;
 		// change it back to global coordinates.
 		vm_vec_unrotate(&new_phys_info.desired_vel, &local_desired_vel, &new_orient);
diff --git a/code/network/multimsgs.cpp b/code/network/multimsgs.cpp
index e7b5d9a677d..dafeb087ea3 100644
--- a/code/network/multimsgs.cpp
+++ b/code/network/multimsgs.cpp
@@ -2646,7 +2646,7 @@ void process_ship_kill_packet( ubyte *data, header *hinfo )
 	}
 
 	// maybe set wash_killed
-	if (extra_death_info & EXTRA_DEATH_VAPORIZED) {
+	if (extra_death_info & EXTRA_DEATH_WASHED) {
 		Ships[sobjp->instance].wash_killed = 1;
 	}
 
@@ -7633,7 +7633,8 @@ void process_homing_weapon_info( ubyte *data, header *hinfo )
 	}
 
 	if (flags & HWIF_BIG_UPDATE) {
-		wp->creation_time = Missiontime + missile_lifetime;
+		// the sender packed the missile's age, so walk creation_time back from now to recover it
+		wp->creation_time = Missiontime - missile_lifetime;
 		weapon_objp->pos = missile_pos;
 		weapon_objp->orient = orient_in;
 		wp->launch_speed = launch_speed;
diff --git a/code/network/multiutil.cpp b/code/network/multiutil.cpp
index d9deec24046..47f6a014913 100644
--- a/code/network/multiutil.cpp
+++ b/code/network/multiutil.cpp
@@ -3625,9 +3625,9 @@ int multi_pack_unpack_desired_vel_and_desired_rotvel( int write, bool full_physi
 			a = bitbuffer_get_signed(&buf,5);
 			b = bitbuffer_get_signed(&buf,5);
 			c = bitbuffer_get_signed(&buf,5);
-			pi->rotvel.xyz.x = pi->max_rotvel.xyz.x * i2fl(a)/15.0f;
-			pi->rotvel.xyz.y = pi->max_rotvel.xyz.y * i2fl(b)/15.0f;
-			pi->rotvel.xyz.z = pi->max_rotvel.xyz.z * i2fl(c)/15.0f;
+			pi->desired_rotvel.xyz.x = pi->max_rotvel.xyz.x * i2fl(a)/15.0f;
+			pi->desired_rotvel.xyz.y = pi->max_rotvel.xyz.y * i2fl(b)/15.0f;
+			pi->desired_rotvel.xyz.z = pi->max_rotvel.xyz.z * i2fl(c)/15.0f;
 
 		}