Max Evans' full name is Maxwell Evans, yet in this episode and Roswell: 285 South
(1999), Michael nicknames him Maximilian, which is sometimes considered a character error. See more
The thing is, we don't know anything about these Czechoslovakians. Are they good Czechoslovakians? Are they bad Czechoslovakians? We don't know. They're just random Czechoslovakians. For all we know, they don't have their passport.