The fridge postcard is a not teasing of Fraiser (or anyone else's) sexuality, it's product placement. Maggie Blancs' husband Jean Francois was a painter who often did male nudes.
Frasier says he traveled 4,000 miles to get to Belize. To be specific, Belize is 3,791 miles from Seattle, Washington.
The car that Lana and Frasier wreck has a Volkswagen engine. It appears to be a 2001 Volkswagen Passat Wagon.