(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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Gigantic Flow instead of multiple Subflows
Hard-coded authentication instead of using Named Credentail
Nondescriptive variable names in Flow
Unjustified big number of Record Flows on one sObject
Method with 100s 'i++' lines for fake code coverage
Hard-coded ID
DMLs in loop
No assertions in Tests
Only catching general catch(Exception)
Excessive lack of .startTest() and .stopTest()
Getting IDs by loop instead of Map(records)
No checking collection emptiness before DML
SOQLs in loop
No flags to deactivate trigger declaratively
Multiple triggers on one sObject
Public Read/Write OWDs
Excessive amount of System.Debug()
No Test data factory/builder
Hard-coding UI text instead of Custom Labels
SOQL without WHERE or LIMIT outside Batch
Calling Queueable in loop without control mechanism or logging
