Lee says to send an ambulance to 25 Blackstone Drive, but when Gordon entered the home earlier, the number above the door was clearly 315.
The bride and groom an the ledge are ready to jump, from their point of view on the right the bride, on the left the groom. The scene when they finally fall, they switch sides.
When Gordon is entering Lee's house, a phonograph is seen and music can be heard playing. However the needle on the phonograph is not touching the record, therefore it would not be able to play any music.