'Out Cold' is very loosely based on 'Casablanca.' It can be seen when Rick has the flashback of him and Anna, when Rick says "Of all of the bars in all the ski towns in Alaska..." (much like "Of all the gin joints in all the towns in all the world..."), when Anna has Luke (Sam in "Casablanca") play their song and Rick walks in and finally in one of the closing scenes when Anna gets on the plane and Rick says "We'll always have Pedro O'Horny's," which is a direct reference to Humphrey Bogart's famous, "We'll always have Paris."
When Pigpen is snowboarding towards the cliff to save the Solid Gold Dancers his bindings are set with his toes out. However, when he is in the air his bindings shift so that both feet point with toes forward. Once he lands on the gondola his bindings magically shift back.
Rick: Pig Pen, when I want advice about a good Planet of the Apes film or maybe how to get the resin out of my bong I'll come to you ok? But I am not gonna take romantic advice from somebody who cannot spell romantic or advice... or bong.