I'm not an instructor and nor do I fly anymore but........a friend of mine recorded his first solo and then showed all and sundry the result. What I did notice was that, while giving running commentary during his flight he gained 500ft on the downwind leg. Perhaps concentrating on flying rather than the commentary this may not have happened. Did he notice the error, he certainly didn't mention it and, to be honest, nor did I as I didn't feel it was right to burst his bubble, after all, he did get back safely