Dazza G was revealed to be a fake, so I would recommend not watching his videos. He’s also annoying as fuck.
Jake Fraser, the moderator at RockNRolla’s stream pointed this out: How come Bonanza never starts at 34300 megaways on any of Dazza G’s videos? Cus it happens to me on every single casino, every single time I open Bonanza, that’s the default screen. It also ALWAYS shows G O L on the screen, but Dazza always starts his videos with the autospin tab covering the board, so you don’t see anything but the megaways, and it’s never 34300 for him. He also seems to get a shitload of bonuses on a 100x stake starting balance, something I can assure you that after a million spins on the game, rarely happens.
As for the tells, I know there’s a tell on Jack & the beanstalk (NetEnt). After landing 2 scatters, the 3rd scatter sound will come before the remaining reels are done spinning if the bonus is landing. Useless tell really, but it’s a tell anyway.
Bonanza seems to have a tell wherever the game response time is slower than on other sites – Spins will land faster and cascades while having a tease (G O L) on the screen will immediately start flashing if the cascade is gonna give you a win or the D. This is not accurate for all sites though.
Anyway, like @argyl53 said, there’s no point in these tells. You can’t use it for your benefit. Also, Dazza G is a fucking twat.