At the UMAKA store, there is a display stool called 'AVFÖRING.' However, in Swedish, avföring means stool (as in feces).
The Swede's accents aren't Swedish but German. As a result, this includes words they claim to be Swedish, like "fishingflaggen."
The Swedish names like Knut and Olof aren't pronounced correctly, and Dorta isn't a Swedish name.
ABBA is mentioned in this episode.
Having seen Mamma Mia sixty times, Mr. Moseby reveals that he would wait outside the stage door for autographs until the cast got the restraining order implying that he may have stalked them.