Other mistake: The Duke is picked up in New York. They are headed to L.A. via Chicago. Jack has Eddie wire $500 to Amarillo, Texas. The route from Chicago to L.A. would not take them anywhere near Texas.
Other mistake: Ok, this is being nitpicky, but in the scene where Freddy is pretending to be paralysed, and Lawrence (pretending to be a doctor) is whipping him on the legs in front of Janet to taunt him and get him to crack, in reality, Freddy's face would have been bright red from the pain. He could never hide that.
Other mistake: When JoJo is babysitting Phoebe, Kat and Tim run in from the rain. His arm had been around her briefly but when she is in the doorway, he is behind her and both his hands hold up a raincoat. JoJo had made up an excuse about Kat's mother being ill to cover for Kat and Tim's absence. Kat and JoJo leave and have a discussion in the car about whether Tim's wife knows about them. JoJo says "So he had his arm around you, so what, right?" But JoJo had not seen his arm around Kat.
Other mistake: When Rico has Walter in the jungle, he yells to Dundee "I know you're up there" (and it echos), then he yells "come down" (and it echos), then he says "or I will shoot your friend", but that line doesn't echo.
Other mistake: When Frank and the Ghost of Christmas Past are at the office Party where the younger Frank is still working, as they stand by the entrance door two women leaving move in closer to try and avoid bumping them - despite the fact that the Ghost said earlier they couldn't be seen or affect what's going on.