Nancy Drew: Danger By Design Easter Egg - Flushing Toilet

1) When you go into Dieter's darkroom to develop the fabric photos, flush the toilet ten times. An easter egg should appear in your inventory. Turn around, and voila, your pictures have been developed!

2) Once you have the easter egg and have looked at Jean Mi's PDA for Hugo Butterly's number, try calling these numbers with the easter egg:
48-15-16-23-42
10-80-01-08-00