Looking at the pictures, he glided the aircraft to an open field and landed without the landing gear.
The PT-22 doesn't have retractable landing gear. They were there. They probably broke off in the crash. What he did is pretty much all you can do if you lose an engine at that phase of departure (all fixed wing aircraft departing KSMO on 21 turn to climb out over Penmar - a municipal, public 9-hole golf course - for noise abatement). Here's me departing that same runway over that same golf course, a little bit ago: https://www.youtube.com/watch?v=4Fv0_gLG3C4 He was probably 2-300' AGL, not high enough to return to land on 3.