When Courage and Bigfoot have a food fight, they end up covered with fruit and dance together. Their fruit outfits, dancing style and the music are all a reference to 1940s entertainer Carmen Miranda. She appeared in about 20 films and 15 TV shows - this brief reference could be to any one of those.
When Di Lung cuts off Eustace, there is no visible stop sign or yield sign, so it is unclear who actually had the right of way. However, Eustace was driving on a two way yellow dotted road while Di Lung was driving on a road with no lines. Also, at a t-intersection, most of the time the road going into the main road has to yield the right of way to the road it is perpendicular to. Therefore, despite Di Lung yelling at Eustace to watch where he's going, he is probably the one at fault, while Eustace probably had the right of way