The alternator charging systym indication is different. The ASI is in MPH on early C150s.Early C150 s will have Turn Indicators rather than Turn Co Ordinators
The main difference which no one seems to have picked up on is the Go Around with 40 flap. I once flew over a student in a C150 that had just killed himself at Coventry attempting a full flap GA. (Early C150s do not have continuos travel on the electric flaps when switched). Despite old wives tales C150 do climb away with full flap down but only if you fly accurately( i used to teach take off and circuit with full flap selected to demonstrate capability and trim changes etc)
Remember a bad instructor always teaches landing as a priority over going around.