Your problem appears to be that when the talent walked into shot they cast a shadow on your green screen resulting in the keying not working where and when those shadow occurred. Trick is to keep talent at such adistance in front of green screen to avoid shadows, ensure the green screen is lit evenly with out any hot spots, avoid creases in green screen material.There maybe things you can try to fix your current problem (i) use a crop tool (ii) change the background from a room to green bush/trees etc. (iii)try whatJack advises(iv) try to adjust your brightness levels (v) place an advertisment for you uncles shop over the effected area….. etc. etc…Good Luck.
