
Burgess only filmed one scene in Philly
The only part of Rocky that Burgess Meredith filmed in Philadelphia was Rocky hurrying after him down Tusculum St and shaking hands under thr street light as the El train passes by overhead.
Everything else -- gym interior, Rocky's apartment interior, the Apollo fight-- was filmed in LA.
All Carl Weathers scenes were filmed in LA, so he wasn't in Philly at all.