Continuity mistake: After their engagement in 2-25 "The Wedding", Debra introduces Ray to her priest Fr Hubley but in this flashback episode "The First Time" Marie brings Fr Hubley to Debra's apartment to meet her. The priest mentions that "he's known the Barones for quite some time."
Continuity mistake: In the last scene where everybody is in Ray's living room, the strap on Georgia Engel's purse keeps changing positions from hanging from her left shoulder to across her chest. Finally, when both her hands are occupied trying to light a match, her purse slips from her shoulder to her bent elbow. In the next shot, her hands are still not free, but the purse strap is on her shoulder again.
Continuity mistake: At the beginning of the ceremony, Kevin is seen between Robert and Bernie and is all spiffy but when Debra is walking up the aisle with Warren, you see Kevin looking normal with a tux behind Lois and, then, a moment later, he is all spiffy again between Robert and Bernie.