You can spot them pretty clearly as a bingo card is placed on the screen and the games are rendered against the cards as the slot reels are spinning. Some players have played them enough to be able to spot winning/losing patterns on the cards faster than the reels can render.

How to Win at Bingo: 9 Expert Tips to Know

1
Use the Perfect Amount of Cards. One of the ways to win bingo is to increase your chances. ...
2
Prepare For the Game. ...
3
Play Smaller Games. ...
4
Consider Probability Theories. ...
5
Pick a Range of Bingo Cards. ...
6
Choose Your Seat Wisely. ...
7
Make a Budget. ...
8
Highlight Special Winning Patterns.