Our Very First Show, Again - S1-E1
Continuity mistake: When Jessie is done singing "Forever" Stephanie is holding a tambourine. Everyone starts clapping, and Stephanie is not holding anything in her hands. The shot changes and she is holding the tambourine again.
Continuity mistake: When Full House started, it was stated that D. J was 10, Stephanie was 5 and Michelle was a baby. The Tanner girls were five years apart but in Fuller House, Stephanie says, "I'm 36", in response to an old lady calling her older than 50. But, D. J's 40th Birthday is not until the next season. D. J was still 39 at the time so Stephanie couldn't have been 36 or else D.J. would have been 41. Also, DJ's 39th birthday is in S2 and her 40th is in s5?
Continuity mistake: In the original Full house, there was a closet in the room that ended up being DJ's but that closet seems to have disappeared in the Fuller house episodes when they show what is now Tommy's room.
Welcome Home, Baby-to-Be-Named-Later - S5-E1
Revealing mistake: After the baby gets her name D.J. takes baby Danielle from Jimmy and holds her. If you look closely you can tell that the baby is a doll.
Our Very First Show, Again - S1-E1
Continuity mistake: When D.J. is talking about finding a place to live, she is holding a few things. The way she is holding them changes between shots. (00:07:25)
Moving Day - S1-E2
Continuity mistake: In the opening scene in the kitchen the straw in the milk shake switches between standing straight up and leaning against the glass between shots.
Continuity mistake: When Danny is talking to Max after the final time he puts the carton of chocolate milk on the counter, there is a blue side and a black side that keep facing different directions for the rest of the scene.
Continuity mistake: When Fernando is playing with Tommy he puts a flag on the ground that changes position a couple of times.
Continuity mistake: D.J. is sitting at the table with Tommy. She gets up and Tommy reaches for the apple. The next time we see the table the apple is now on the other end of it. Then when Stephanie walks over the apple is now back over near Tommy.
Moving Day - S1-E2
Continuity mistake: When Stephanie is holding Tommy and talking to D.J. on the phone, in one shot Tommy is holding a toy that he was not holding earlier or after.