Hit Me With Your Best Shot - S2-E21
Continuity mistake: After ALF breaks the board, Brain puts one piece in front of him. When Willie walks in it has moved to the middle of the table.
Working My Way Back to You - S2-E1
Continuity mistake: When Kate tells ALF that he's won she is not holding anything. The shot changes and she is now holding an orange.
Continuity mistake: When ALF is writing down what Kate and Willie are saying the paper he is writing on is in a different position in one shot.
Visible crew/equipment: When Kate says they are going on a hike a boom mic is visible.
Continuity mistake: When Kate says "I don't believe this" she is holding a cup. The shot changes, she isn't.
Continuity mistake: During the opening scene Lucky keeps changing position.
Strangers in the Night - S1-E2
Continuity mistake: When Willie and ALF are talking in the bedroom, the puzzle box on the bed changes position several times.
Some Enchanted Evening - S2-E6
Continuity mistake: After Willie takes Alf into the kitchen to talk to him about someone at the Halloween party might realise that he's an alien, notice the zipper on the front of Alf. Out of nowhere, during one cut, a piece of black tape appears at the top of the zipper going across the top of Alf's chest that wasn't there before, then disappears in the next cut.
Mother and Child Reunion - S1-E13
Continuity mistake: After Willie and Alf talk about what's for breakfast, in the far away shot Lynn has a bottle of orange juice and she begins pouring it into a glass, then she starts putting the lid back on the bottle. When the camera cuts to a close up of just Alf and Dorothy, not only is the bottle of orange juice already sat down but Lynn starts to grab her glass of orange juice without anytime to have put the bottle down, let alone to start to pick up her glass. (00:16:30)
Continuity mistake: When the FBI agent says "We will have to call the president on that one" Brian is in the background with his hands on the edge of the stool. When the camera cuts to Brian saying "I'll call him for you" he is sitting in a different position. (00:18:15)
Going Out of My Head Over You - S1-E20
Continuity mistake: After ALF sprays Willie with the flower, Willie wipes his mouth with his right hand, then when the camera cuts, Willie's hands are all of a sudden at his sides. (00:04:05)
Continuity mistake: At the beginning, there is a side shot of Alf on the phone that has Alf saying "Sammy...shalom" with his right hand on what appears to be a phone book. When the camera cuts to the front angle, not only is Alf's right hand all of a sudden on the phone cord, but the phone book has also changed positions. (00:00:20)
Continuity mistake: When Lynn says "Mom, I need to use the phone," we see Kate raise her left hand and point then say "In a minute, dear" then when the camera cuts to another angle, Kate's right arm is all of a sudden on her neck. (00:00:55)
Continuity mistake: After Willie is arrested, he is talking to Kate while he is in the jail cell. Willie then begins to say "I don't know what happened. All I know is someone used my radio and now I'm a criminal and they're going to hang me" with the camera view being behind Kate with Willie's hands outside the jail cell bars. Then when the camera cuts to inside the cell, Willie's hands are not only inside the cell but Willie is further back away from the bars with his hands inside the cell, with no time to have made the move. (00:10:30)
Answer: Mr Tanner actually asks Alf, "Why are you carrying our towels through the den?" The streaming subtitles are wrong when it substitutes "damp" for "den" twice. It's possible the error originated from the VHS or DVD, which occurs often.
Super Grover ★
Yes, I was re-watching episodes, and I heard "den" the next time. Thank you for answering, though.