During Topeka's picnic, there is a grower's label seen on one of the bananas. The fruit is grown hydroponically, not store-bought.
While the marching band at Topeka's picnic passes the camera, the girl playing cymbals doesn't actually clash the cymbals. She only pretends to do it.
Near the end of the film, when Vic is speaking with Blood outside the entrance to The Down Under, Vic refers to him as "Tiger", which was the dog's actual name.