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The star that Caillou creates for his Christmas tree alternates between one that looks perfectly cut and has perfect symmetry and a somewhat sloppy one that looks like it was cut out by, well, a kid.
Close-captioning spells the name of one of the horses on which Caillou rides at the Christmas tree farm as both "Blackie" and "Blacky."
Sarah's school Christmas play is extremely short, about two minutes long at best.
Caillou at first seems like he has never seen a doghouse before, but he saw one in "The World Around Me" episode
In the "Elephants" segment, Mommy says that they'll pick up Daddy from work on the way to the zoo, but once they're at the zoo, Daddy isn't anywhere to be seen.
Caillou acts like he's never seen a wheelchair before in this episode, but he just met a lady in one a couple episodes back in "Step by Step." This is what happens when episodes are shown out of production order.
In the "Caillou's Safari" segment, when Caillou is in his room with Teddy, there's a toy dinosaur sitting right nearby Teddy that inexplicably looks like Leo's dinosaur Dino from the previous episode.
Caillou is shown as having lots of different shirts in this episode, yet normally he is almost always shown wearing a yellow shirt with a red collar, or, in the original five-minute episodes a non-descript dull grey shirt with the same red collar.
In the "Caillou Becomes a Waiter" segment, Caillou tells Julie he can't pay her because he doesn't have any money, but he was just given five cents.
The segment "Trip on the Subway" doesn't make sense. Clementine lives in the same neighbourhood as Caillou (this is evident in Caillou's Halloween, in which they went trick-or-treating together), and thus there's no need for taking the subway to visit Clementine.
Watch the clock in Caillou's kitchen in the "Firefighter" segment closely as it changes to more and more unlikely times throughout: 8:50, 9:10, 10:10 and finally 3:10.
In a second example of clock goofiness, the second hand on the alarm clock that Caillou is given in the "Timekeeper" segment does not move.