The most common bull flag mistakes are entering before the breakout confirms, trading loose flags, ignoring volume, mistaking any pullback for a flag, and poor stop placement.
Other common mistakes include trading loose flags with depth greater than 20% of the flagpole, early entry before breakout confirmation, poor stop placement, ignoring the higher timeframe trend, and holding failed patterns after invalidation.
Look for orderly consolidation, not choppy reversals, and remember that weak breakout volume often signals that buyers lack conviction.