justin,
it would seem the German was having some fun with Brown (putting some fear in him). Photos of the V3, WNr 230003, CP+UC, have the handles attached to the fuselage sides, not the canopy.
The Monogram/Monach Do335 book says the V2 or the V6 crashed (V6 in the text, V2 in a chart) due to a rear engine fire that burnt through the control cables causing a lose of control.