(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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No flags to deactivate trigger and validation rules declaratively
DMLs in loop
Getting IDs by loop instead of Map(records)
Hard-coded ID
Exactly 75% test coverage
Missing bulk tests in test classes
Non‑descriptive variable names in Flow
Excessive lack of .startTest() and .stopTest()
SOQLs without WHERE or LIMIT outside Batch
No Fault Paths in Flows
Multiple triggers on one sObject
Public Read/Write OWDs
Gigantic Flow instead of multiple Subflows
No test data factory or builder
Hard-coded authentication instead of using Named Credentials
Only catching general Exception in try-catch
Checking collection emptiness before DML
Using Profiles instead of Permission Sets
Multiple Record Triggered Flows on same OperationType on one sObject