When Devon is playing in the practice room, his drum is connected to a computer so his notes would be recorded. However, when his notes show up on the computer screen (when Sean says "That's all you"), some of the the notes appear to have accidentals. It is not possible to play flats or sharps on a snare drum.
Inputting drum beats into a computer is done thru a midi file, which does indeed use sharps and flats to designate what kind of drum sound(snare, tom, bass, cymbal, click, cowbell, conga, etc...) the computer should use in order to replicate or play back what was recorded. Thus, there is no mistake evident in that film clip. I know because I have been programming midi files professionally for the past 15 years.
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