While watching this bizarre little movie with my mother I took note of some vehicles I overlooked. All background, and before you yell at me, they're all prominent background vehicles. Nothing eensy-wheensy.

Unknown blue car.

Unknown bus. Seems to be Mercedes but don't quote me.

Unknown red golf cart offroad...thingie.

Jeep CJ-something-or-other (not a Wrangler like the other one).

Blue = 1993-95 Plymouth Acclaim

http://www.imcdb.org/movie_1014775-Beverly-Hills-Chihuahua.html

The ratio of these 4 is different than all your previuos pictures in this movie

I guess they come from the fullscreen (4:3) version, and other ones were from the widescreen version.