Factual error: When Morty is showing Michael how to use the remote, Michael rewinds to a family vacation in 1976. A childhood friend of his invites everyone over to his parents' RV to watch Three's Company. Three's Company didn't premiere until 1977.
Continuity mistake: The ice cream scene at the 4th of July, the daughter is eating a bowl of ice cream that is below the rim of the bowl. The next shot, her bowl is loaded with ice cream.
Continuity mistake: In the breakfast scene Michael is nipping from his coffee cup. Then a close-up on Janine. Michael holds the cup a bit away from him. Again we see Janine. Then Michael puts the cup down to the table. Another shot of Janine (with her hands to her breasts) and then we see Michael again putting his coffee cup down. Then a few seconds later he starts to fill milk into his bowl. A short shot of Janine and Michael is already chewing while he speaks to Janine holding his spoon in his right hand. Then Janine stands up and walks a bit. Michael turns towards her and the spoon is down in his cereals and he has his right hand down beside his right leg. (00:22:50 - 00:23:40)
Continuity mistake: In the scene where the kids are coming downstairs to get a Twinkie, the box changes from Spanish to English from the view of the stairs.
Continuity mistake: In the final hospital scene, after Ben and Samantha leave, the nurse goes over to talk with a patient in the background. The nurse is just talking to the patient, then we see Michael rip off his oxygen tube and get up. Then we see a shot of the nurse again and he is washing the patient with a sponge of some sort. The nurse then approaches Michael. Then we see a shot of the patient again and the sponge is nowhere to be found.
Other mistake: When Mike stops time to hit his boss, he starts getting off the desk. There's a bottle of water on the desk, however, the water is moving around from Mike moving on the desk. How can the water move if time is frozen/paused?