When the crew is walking through the snow toward Santa's house, the song that is playing is Hidden Flame by Viking Skull. The band would often record at Bam Margera's house in West Chester and Chad I Ginsburg (co-star of the film) wrote and plays the guitar solo although he is not an official member of the band.
Tattoo artist is Juho Juntunen. He has tattoo studio (Tattoo You) in Tampere, Finland. He is a close friend of Ville Valo and he wrote the book "HIM - Gone With The Sin".