Qualifier: I've flown B-25s SIC a few times but I don't have a type rating. See this photo from the MAAM website:
http://www.maam.org/airshow/images/b25_flapgear.jpgThis is on the floor between the pilot seats. In the photo, the flap handle is black with a yellow latch. The handle stays in a neutral position, push forward for less flap, push aft for more, and return to neutral once the desired setting is reached.
The gear handle is red. The silver hook is a safety catch to prevent inadvertent raising of the gear. The safety catch is disengaged first, the small red handle is moved second, then the large handle is moved up for "gear up". The process is reversed to lower the gear. The motions of one of these levers is unlike the other.
I'm not a B-25 expert (and if I misspoke above, someone please correct me) but I do have a substantial amount of multi-engine time. I'm simply wondering why any handle was being moved at 60 KIAS on takeoff roll (according to NTSB), particularly without being commanded by the pilot flying.
That said, we all make mistakes, me included. I'm just glad no one was injured.
Ken