Glitches when rendering video in sequencer

Can anybody please advise if there is a way to stop these small glitches (around second 4) from happening?

Also, does anybody know how might be the best way of stopping the eyeball from being seen through the skin on the male character, please?

Thank you

That glitch might be a frame out of sequence range and there is a camera re-spawn happened.

Yes that is a small gap of one frame between the shots or the playback range of the sub sequence. Happend to me too. Just zoom in and align the shots perfectly.