I wondered about putting an AC power cord close to the display to see what would happen.
I posted TMNT info: www.seanriddle.com/tmnt.html
The graphics in the patent are quite a bit different from the game. The mousers are in different poses, on the LCD the underwater turtles have bubbles coming up from their mouths, the design of the bomb is sticks of TNT in the patent but a cartoon bomb on the LCD, etc. But everything is in the right place, it looks like.
I also got a Tiger Copy Cat, which is a later version of the Sears Follow Me. It also has a TI chip, but interestingly, it's a 20-pin DIP. I'm guessing it's a TMS1000 with 8 pads not bonded out.