The Anderson home, where Ed is captured at the end of the movie, is the same house used as the Jarvis' home in Friday the 13th: The Final Chapter (1984).
We can see that the cash register at the local store reads $2.22 before Gein's purchase is rung up. When we hear the distinct sound of the cash reel mechanisms, the clerk tells Ed "that'll be $2.22" even though nothing moved. A few days later Ed steals the cash register and puts it in the back of a delivery truck, and the readout still shows $2.22. Clearly a non-working cash register that the producers tried to get too much mileage out of.
After Ed kidnaps the bartender, he takes her home in his truck. on the way home they pass a vehicle traveling in the opposite direction. the vehicle has rectangular headlight. this type of headlight was not found on vehicles in the '50s.