The episode's end credit sequence rather infamously jumps back to the "You can freeze while you get tan" cut instead of the cuts at the end of the song. When the episode was re-broadcasted in 2011 with the season 3 episode "A Phineas and Ferb Family Christmas", this mistake was fixed. Other differences in the 2011 version include adding Alyson Stoner (Isabella's voice actress) to the chorus of "It's S'Winter" which wasn't there originally.
However, the 2011 re-broadcast introduced a new error unique to this version. In the credits and only in the credits, when Adyson, Isabella and Gretchen strike their poses during the line "Unusual and grand," some of their outlines are completely missing. This is notable because the original 2007 version did not have this problem.
Also please excuse the lower quality of the 2011 release. The pack I got this from did not include the rerelease so I had to find it on Disney+ and Disney+ does not play nice with video quality on desktop.