The interior shots of the car ride to the lake show the car having high tail-fins, but the exterior shots of the car show the car having no tail-fins.
June finds Wally listening to serious music, comments that it's "very pretty", then shows us (the audience) the (vinyl) record-album cover which has the title "Love Themes from Famous Operas". The music we hear, however, is not from an opera but rather Tchaikowsky's overture-fantasy "Romeo and Juliet", a purely orchestral piece.