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)
Mother and Child Reunion - S1-E13
Continuity mistake: After Dorothy tells Alf that her 'mop from the moon" comment was an insult, Alf says "If I had a straw and a napkin, I would fill you so full of spit balls." while Dorothy is looking right at Alf but when the camera cuts to just Dorothy, she is all of a sudden looking upwards as she says "Do you hear how he's talking to me?" (00:16:55)
Audio problem: When ALF is starting to put the clothes pin under his mouth, you can hear a far off yelling in the background about a second before ALF actually starts to yell. (00:12:25)
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.
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)
Working My Way Back to You - S2-E1
Continuity mistake: At the beginning of the episode, Mrs. Tanner scolds her son Brian for dumping all of the clothes from the clothes basket. When she first scolds him the basket is white; it cuts again to her, and now the basket is brown and a different shape, too.
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.
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.
Hit Me With Your Best Shot - S2-E21
Continuity mistake: Lynn pours milk on her cereal and she starts to put it down. The shot changes and she starts to pour the milk again.
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.
Continuity mistake: When Willie is trying to tell ALF what labor is, the phone on the table keeps going from being on an angle to straight.
Continuity mistake: After Raquel leaves the Tanners' house after she asks the Tanners about Elvis being next door, Willie walks into the dining room and Alf is sitting at the table with the Elvis sightings book next to him. Throughout the whole "Kings comparison" between Willie and Alf, the book on the table changes positions after every few cuts from Alf to Willie. (00:03:30 - 00:05:00)
Continuity mistake: After Trevor shows Kate and Willie the house for sale sign, Alf is in the kitchen talking into a tape recorder about being blackmailed. There are soda cans to Alf's right next to the recorder and one can of root beer on its side just above the recorder. When it cuts to Kate and Willie walking into the kitchen, the downed can has been moved, and the red can of cola is gone. After Kate says "And it wasn't my mother, either", there's a close up of Alf and the cans are back. (00:04:25 - 00:07:05)
Visible crew/equipment: After Neal answers the door, Mrs. Watson asks 'May I come in?' When the camera cuts back to Neal saying 'Oh gee do you have to?', look in the background to see a shadow of a person move across the cabinet. (00:12:00)
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.