Pifias

The sundaes on the table during dinner disappear and reappear between scenes.

During the Thanksgiving "dinner" scene, Peppermint Patty's plate of food disappears and reappears after Snoopy serves her.

As Franklin sits alone on the opposite side of the table from which Snoopy serves "dinner", empty chairs adjacent to him disappear and reappear.

While Snoopy, Linus, and Charlie Brown are cooking the fake Thanksgiving meal, two bowls of pretzels are shown. They're the folded type. Later during the meal, they change to pretzel sticks.

The plates Snoopy set out when he initially set up the ping-pong table disappear in front of all guests except the first person he tosses a plate to when serving everyone.

A scene shows Charlie Brown checking to see if he's gotten any mail. However, there is never any mail delivery in the U.S. on Thanksgiving Day due to it being a federal holiday.

Marcie calls Charlie & Peppermint Patty : "Miles & Priscilla". Referring to Pilgrims "Priscilla Mullins", "John Alden" and Myles Standish.". It's been said that the story was true about the romance/ love triangle , but the historical evidence is inconclusive.

When Charlie Brown states that Thanksgiving is upon them, Sally shouts that she hadn't finished eating all her Halloween candy. She never had Halloween candy during the events of "It's the Great Pumpkin, Charlie Brown." However, "It's the Great Pumpkin, Charlie Brown" took place in 1966, and clearly Sally would have gone trick-or-treating in any ensuing years afterwards.

It is puzzling why Snoopy did not serve the turkey and pumpkin pie to Charlie Brown's guests rather than saving them for himself and Woodstock. Serving to the guests would have been truer to the spirit of Thanksgiving and the two would have simply eaten the leftovers.

The lawn chair that came to life and fought snoopy was destroyed, but then it was somehow fixed when Franklin came and sat on it.