Here's the problem when you get into the exotic scales, you find the same scale with several different names, and then 2 totally different scales w/the same name.

Double Harmonic
LookNoHands has the Double Harmonic scale as being ;
G Ab B C Db E F G
and the Hungarian Gypsy as being
G Ab B C D Eb F# G
The Falcon on Guitar tricks has the double Harmonic as:
G Ab B C D Eb F# G

I'm not sure which one is right, I always considered G Ab B C D Eb F# G as being double harmonic.