The "Roulette Assault" episode of the old History Channel series "Breaking Vegas" covers another way to beat roulette but without requiring computers or communications devices in the casino or timing anything. Archive.org has a copy of that episode [1].
A family went to casinos around Europe and observed the roulette wheels, keeping extensive records on where the ball landed. They were not covert about it. They'd just openly write down the results.
You might think casinos would not allow that, but actually they love people who do things like that. A person taking notes is a person who thinks they can invent a system to beat the casino, and those people often lose a lot of money before giving up.
The family took all that data and analyzed it to find wheels that had slight consistent biases that were big enough that bets based on them would come out ahead long term. They then went around making those bets and won long term.
The family members had spent so much time looking at wheels that they could recognize individual wheels by things like scratches and discolorations and other ordinary visible wear and tear, so even if a casino moved a wheel the family would recognize it and know which bets to place.
There are a couple other "Breaking Vegas" episodes I remember as standing out.
"Ultimate Cheat" [2] is about another way to win at roulette, but this one involved a team cheating on the bets using a twist on an old cheating method.
There's an old way to cheat on bets where you place small bets that consist of a stack of minimal value chips. You adjust the stack so that the croupier cannot actually see the bottom chip. You and your teammates all do this.
If one the bets wins you try to use sleight of hand to replace the stack with a stack that consists of minimal value chips except for a high value bottom chip, still arranged so the bottom chip is not visible to the croupier. Your teammates can help by trying to distract the croupier so your sleight of hand won't be spotted.
When the croupier goes to your winning bet you point out the amount is wrong and point out the high value chip in the stack that the croupier missed.
Casinos are on to that, and if they suspect at all that you are doing it before paying out they will go to the security tapes to make sure no one tried any sleight of hand on the winning stack.
The team in this episode realized they could work this the other way. Instead of trying to retroactively raise the value of winning bets they could retroactively lower the value of losing bets.
So now the first stack is a stack of low value chips with a high value chip on the bottom with the stack askew to hide the high value chip. If the bet wins no sleight of hand is needed. The high value chip is already in place. If the bet loses that's when they try sleight of hand to switch it for a stack with all low chips. That's easier than switching a winning stack because the croupier is paying attention to the winners.
If the casino goes to the tape after a win no problem. The tape will show no tampering because there was none.
The casino security people knew the team was up to something for quite a while and were scrutinizing every one of their wins and getting really annoyed and frustrated that they couldn't figure out what the heck was going on.
"Counterfeit King" [3] was about counterfeit casino tokens. Manufacturers incorporate a variety of anti-counterfeiting measures in their token designs, but Louis Colavecchio was able to match them all. The only reason anyone knew there was counterfeiting going on was casinos were finding themselves gaining token. No one, including the token manufacturers, were able to figure out which tokens were genuine and which were Colavecchio's.
[1] https://archive.org/details/breaking-vegas-s-1-e-10-roulette...
[2] https://archive.org/details/breaking-vegas-s-1-e-01-ultimate...
[3] https://archive.org/details/breaking-vegas-s-1-e-06-counterf...