Dennis and Pie Face disguise themselves as a dog called Trojan, a reference to the Greek mythology Trojan horse that was said to see the downfall of the city of Troy.
Inside the house of Gnasher's fleas are 3 smaller Gnashers on the wall, a reference to the Beswick bird ornaments that were popular in the 1940s and had a resurgence in the 1970s thanks to Hilda Ogden in Coronation Street.