I'm reading Petzold's The annotated Turing, and Petzold notes from time to time errors (or typos) in the original paper of Turing. Sometimes (I find) these errors may be completely misleading, like:  Turing has now exhausted his supply of mnemonic function names, for he  names the next one simply q, which unfortunately is the same letter he  will shortly use to represent m-configurations in general. What's  worse is that he later refers to this function as g.  I believe that  Turing meant for this function to be named g rather than q.or:  Turing's phrase, so that the complete configuration would not be  expressed as a finite sequence of letters, is not quite clear. I  suggest the word not should be now.How Turing's peers could have understood the complete and detailed demonstration of Turing (where any actual error could crash down the whole paper) if such misinterpretable typos were not detected first?
Turing's paper typos
turing machines