Richie called Mother Winslow "Grandma." She's not his Grandma. She's Eddie and Laura's Grandma because she's Carl's mother. She can't be Richie's Grandma because Richie's mother is Rachel, Harriette's sister.
At the beginning of this episode when Steve tells Laura that he just got a job as a gift wrapper at the mall but when he said it said that he is now a "rapper" and Laura thought he was saying that he is now a singing rapper and she said that he can't even carry a tune. But how could that be when in Episode #74, "Dance to the music" that Steve wrote a rap song for Laura asking her to the Homecoming Dance for the 26th time and the song sounded like Steve carried every single tune of it pretty well.
Harriette: Did you have any trouble getting home?
Mother Winslow: Oh, no, not on my snowmobile.
The German episode title is "Das schönste Geschenk", meaning "The Most Beautiful Gift".
Music: "O Holy Night" performed by Telma Hopkins
The title of this episode is a play off the song, "Deck the Halls".