After Myrna leaves at (according to the binary wall clock) 9:37, the following scene (which supposedly takes place some time later) still shows the wall clock displaying 9:37 and remains that way for the duration of the scene, which lasts more than 1 minute.
The new couch, seen in the tag sequence, when Felix keeps nagging at everyone to move it by inches is never seen again in the series.
Oscar is recording an interview with Bubba Smith, but when he plays it back some of the original conversation is missing.
Oscar forgets the back door in the kitchen when he jumps the stairs to avoid the stain on the floor.