- Always Identical Twins: Betty Joe and her twin sister Lorraine.
- Bait-and-Switch Comment: Doofenshmirtz, as usual, describes Perry's presence as an "unexpected surprise". By "unexpected", he actually means "unexpected" this time.
- By "No", I Mean "Yes": Averted. This is the first time where, by unexpected, Doofenshmirtz does mean unexpected.
- Cryptid Episode: Bigfoot is featured.