Corrected entry: It seems that Hope Springs can't quite get her bearings. Bumbling hotel employee Jack Douglas is escorting elderly resident Joan Hickson across the busy street when they are nearly hit by the speeding Hope. Her bike whizzes past the disheveled couple but, a few moments later, she pulls up outside the Palace Hotel - The place she just sped past.
Corrected entry: It is stated in the film that it takes place 12 years after the events of Conquest of the Planet of the Apes. At the end of that film, Caesar was the only ape who had acquired speech. However, in the 12 years since, not only do all apes speak perfect English, they have developed various European accents, and have a number of scholarly apes among them who discuss philosophy and history.
Correction: It's not true that he is "the only ape who had acquired speech" at the end of Conquest. The female ape specifically says "No" to Caesar. So while 12 years may seem like a short time, we clearly are seeing here that the apes are on the verge of speech by the end of Conquest, and they have been observing humans for quite a while now, so it is conceivable that they would simply continue philosophical debate that they may have heard from their human masters, then branch out into their own concerns. In short, this is a world where apes develop speech in an already evolved world. We can't predict how long it would take them to develop their own culture.
Corrected entry: When Snoopy sets up the table, he puts plates out, topped with napkins. The last one was removed, due to Woodstock being under it, and not replaced.
Correction: While we don't see it replaced, plenty of time passes before the guest arrive. In fact, when the guest and Charlie Brown are walking out to the table, Linus and Sally are already standing by the table waiting and could have easily put the napkin back (if it wasn't Snoopy).
Correction: Maybe she just didn't know where the hotel was, and had to turn around. Not really a mistake in my opinion.