(Print) Use this randomly generated list as your call list when playing the game. There is no need to say the BINGO column name. Place some kind of mark (like an X, a checkmark, a dot, tally mark, etc) on each cell as you announce it, to keep track. You can also cut out each item, place them in a bag and pull words from the bag.
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Nondescriptive variable names in Flow
DMLs in loop
Calling Queueable in loop without control mechanism or logging
Hard-coded ID
Unjustified big number of Record Flows on one sObject
Getting IDs by loop instead of Map(records)
Public Read/Write OWDs
Gigantic Flow instead of multiple Subflows
No assertions in Tests
No checking collection emptiness before DML
Hard-coding UI text instead of Custom Labels
Only catching general catch(Exception)
No Fault Paths in Flows
Code in trigger instead of Trigger Handler
SOQLs in loop
Method with 100s 'i++' lines for fake code coverage
Hard-coded authentication instead of using Named Credentail