ALF can be heard laughing at the end of the closing credits in each episode.
After the closing credits in the original unaired pilot, ALF appears and says to the audience "Be there!".
In the opening credits (Series 1 - 2) ALF is seen recording a home movie and films each member of the Tanner family.
In the 2nd opening credit (Series 3 - 4) ALF and the Tanner family are seen watching home movies of ALF.