(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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Checking collection emptiness before DML
No flags to deactivate trigger and validation rules declaratively
Non‑descriptive variable names in Flow
Multiple Record Triggered Flows on same OperationType on one sObject
No Fault Paths in Flows
Public Read/Write OWDs
Using Profiles instead of Permission Sets
Hard-coded authentication instead of using Named Credentials