Carrie leaves some spaghetti on the floor after she scoops some of it up onto the plate. The remnants disappear between shots. Also, the amount of spaghetti and sauce on the plate changes inconsistently.
When Deacon hands Doug the apartment notice, the envelope is sealed. In the next shot, Doug is already holding and examining the contents of the envelope.
When Carrie says she is leaving for the new apartment, she holds her purse with her arms straight. In the next shot, her arms are bent.
When George comes into the dressing room to tell Arthur about the concession stand, he opens door almost all the way. In the next shot he has the door about half open and opens it the rest of the way again.
In the bedroom, when Carrie punches Doug in the stomach, he bends over and winces. As he is recovering, it cuts to a different angle and he is still hunched over and wincing.
Ava is brooding in her dressing room refusing to go on when Arthur successfully talks her into going out and performing. She stands up and says "Cue up the band!" and heads out the door. The music starts up immediately even though she's still in her dressing room. No one in the band was in the room to hear her say that - so how did they know to start playing?