(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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SOQLs in loop
No assertions in Tests
No Test data factory/builder
Nondescriptive variable names in Flow
No Fault Paths in Flows
Gigantic Flow instead of multiple Subflows
Hard-coded ID
Excessive amount of System.Debug()
Method with 100s 'i++' lines for fake code coverage
SOQL without WHERE or LIMIT outside Batch
Public Read/Write OWDs
Exactly 75% test coverage
Excessive lack of .startTest() and .stopTest()
Getting IDs by loop instead of Map(records)
Calling Queueable in loop without control mechanism or logging
Hard-coded authentication instead of using Named Credentail
No checking collection emptiness before DML
Unjustified big number of Record Flows on one sObject