During the party a lady is putting Michelle back in her crib, Michelle switches from being in the crib to in the lady's arms between shots.
If Bullet was rear ended as Jesse was driving away from Pep Boys and that is what caused the car to go into the bay, Jesse and the seat covers would have also gone into the bay. When Jesse arrives home with the seat covers, both he and the box with the seat covers are completely dry.
In "The Big Three-O", Bullit has white-wall tires when Jesse goes to get the seat covers. The tires are solid black when the car is towed back to the house.
When Danny offers D.J. and Stephanie a limo ride, he puts a hand on each of their shoulders. It then cuts to a close-up of D.J. and his arm is not visible.
After Joey leaves for the college comedy tour, Danny converts the garage to a bedroom for Joey. However, in the next episode Joey's room is back in the alcove and the garage is back to normal.