Continuity: In scenes of the table set up with chairs around it before the guests arrive, the white-and-pink-striped lawn chair (the same one Snoopy tussled with earlier) disappears and reappears between shots.
Continuity: The sundaes on the table during dinner appear and disappear between scenes
Continuity: During the Thanksgiving "dinner" scene, Peppermint Patty's plate of food disappears and reappears after she has been served by Snoopy.
Continuity: As Franklin sits alone on the opposite side of the table from which Snoopy serves "dinner", empty chairs adjacent to him disappear and reappear.
Continuity: Near the end the grandfather clock is shown by the front door. It's pendulum appears stuck to the right in one scene but in the very next scene it's over to the left.