In the last scene where Bones tells Booth that she has complete faith in him. Booth says that he will ask her to marry him when the time is right. The camera pans over to the clock under the cabinet and the time flashes from 7:39 to 4:47 and back again. 4:47 is the same time that is on the clock in the episodes "the end of the beginning", "the beginning of the end", "the hole in the heart", and "the past in the present"
Hodgins says to Angela "we have Sleepy Hollow on the DVR". Funnily enough, Sleepy Hollow actually crosses over with Bones later on in the series.
Freddie Prinze Jr guest stars in this episode, he is married to Sarah Michelle Geller, David Boreanaz's co-star on Buffy the Vampire Slayer.
When Dr. Bones says that there is evidence of subluxation of a bone that means that that particular bone has been partially dislocated.