During the opening theme, the show's title "UFO" is flashed on the screen for only a fraction of a second. It appears "officially" on screen at the end of the teaser sequence.
The opening credits of every episode include "Century 21 fashions by Sylvia Anderson". It is uncommon for such a credit to appear at the start of a TV episode (usually such credits appear at the end).
Lead actor credits are not shown during the opening theme music; instead, these credits appear just prior to the guest star credits at the beginning of episodes. Only lead actors appearing in a particular episode are credited.
Guest stars are credited as "guest artists."
The closing credits of the episode "Square Triangle" play over the final scene of the episode, rather than over shots of outer space as per usual.