After PBS decided to not renew their US distribution agreement to broadcast the show on PBS Kids in Early-2021, it was picked up for reruns on Cartoon Network's Cartoonito block in September before being removed the following year once Peacock got the US distribution for the CGI revival series.
Since the early 2010s, the series had received continuous backlash from parents claiming that the show promotes harmful behaviors to children, this is said to be an issue coming from Calliou's constant tantrums without any consequences. The series started a trend of YouTube videos under the title "Calliou Gets Grounded" made with the software GoAnimate.
There's been much criticism that one brief scene in the intro shows Caillou very upset and bang on the floor, which is not too fitting for a kids cartoon opening.
This show stars three girl actresses voicing Caillou - Bryn McCauley, Jaclyn Linetsky until 2002, and Annie Bovaird.
Caillou stopped wearing a gray shirt in 2000