In the scene where the oil tycoon tells Maverick to lower him into Bugs' hole his body disappears for a few frames.
In the opening, the three-panel signpost is a straight post in the long shot, but is offset (bent) in the close-up.
The oil tycoon complains to Maverick that every hole in Texas should be spouting oil out of it, yet in the back ground there are some oil derricks that are not spouting anything.
This cartoon takes place in Texas, yet there are Saguaros in the background. Saguaros are only found in the Sonoran Desert, which is in southern Arizona and northwestern Mexico.