Executive Producer Jonathan Frakes appears onscreen near the end of the first episode. He is the man on stage that announces the crash of the UFO.

Fearing cancellation during the show's first season, fans of Roswell sent tiny bottles of Tabasco sauce (the choice condiment of the show's aliens) to the WB network as part of a campaign to save the show. Roswell was subsequently moved to a new night and time and renewed for a second season.

Heath Ledger auditioned for the role of Max Evans.

Katherine Heigl tested for all three female leads before landing the part of Isabel Evans. Before winning the role of Maria DeLuca, Majandra Delfino originally auditioned for the part of Liz, which eventually went to Shiri Appleby who, like Heigl, tested for all three female lead roles, winning the lead of Liz Parker after several callbacks.

During the opening credits of the show, the names of the actors who play aliens come up on the screen, first in "alien writing," and then are translated into English.

Well so did I, but... then again, I'm just a little bit obsessed, so... Besides, someone probably doesn't know... so there...

By who? You?

The evil ones? Or the good ones?

True... but wait, Rath is... ahem, yeah... and he's sorta evil... what about him?

Gotcha

But can the evil aliens bring Zan back to life for me... er... us?

For ten minutes, maybe... but then I'm taking him to bed...

Nooooo...

Cute. Real cute.