Here you've changed way/782427418/history from the distinctive "Market Hall" to "marketplace", which is something else. The colour is surely a misspelling too...
Best Regards,
Andy

Hello,
You've added 3 services to the Army reserve centre way/679618951/history - is that actually correct, or is it just the army?
Best Regards,
Andy

Hello,
What source did you use for your edit to node/5216237925/history ?
Best Regards,
Andy

Hello,
The change to way/1098931312/history looks like part of a mechanical edit. Was it discussed anywhere?
Best Regards,
Andy

You've deleted node/11576255852/history , but perhaps it's worth asking the previous mapper when construction is likely to start?

This is wrong. way/1250416670 is not a separate link road, it's just a turn lane on the A64.
Please undo your changes to correct the junction.

Are you sure that way/1307048775 is actually allotments and not just someone's vegetable garden?
Best Regards,
Andy

Hello,
Any reason why way/556779914/history is now a service road but the continuation to the west isn't?
Best Regards,
Andy

Hello,
Are you sure that way/40038655/history is residential? It looks like the access to the cottages is the other side of the wall
Best Regards,
Andy

Hello,
You have changed way/537441214/history to an unclassified road.
What is your source for this?
Best Regards,
Andy

Hello,
You have changed way/662637905/history to an unclassified road.
What is your source for this?
Best Regards,
Andy

Hello,
What was the source of your change to way/269007903/history here?
Survey, or something else?
What is the access here?
Best Regards,
Andy

Hello what was the source of your change and removal of information from way/843077021/history here?
Best Regards,
Andy

Hello,
In this changeset you've removed the previous indications that this is actually a public bridleway. Have a look at way/582702738/history and you'll see what I mean.
What I'd suggest that you do here is to contact the previous mappers and ask there if there was a public bridleway fingerpost here. Likely there was, and if so a "designation=public_bridleway" tag should be added.
The change to "highway=service" or "highway=track" makes sense based on the imagery, but only after the designation is correctly mapped.
Best Regards,
Andy

"access=private" does make sense here, so I've added it.
@SomeoneElse/diary/404748 does look at "likely access tags where not declared" and for track (and service is similar) "private" is the likely correct value in England and Wales, unless there's a designation or other information suggesting any different.

I was chasing down a rendering problem wondering why the name did not appear at https://map.atownsend.org.uk/maps/map/map.html#22/53.95317/-1.08447 , and then realised that someone had removed it!
To answer the question, the easiest way to "undo an erroneous change" in a case like this is just to "edit it again and add the name back". There are various changeset revert options, but none are as quick in a case like this as just editing it, as I've just done in changeset/155773016 .
Cheers,
Andy

The user adding these features has been asked to not map temporary ones at osm.org/user_blocks/16614 already.

@TrickyFoxy way/1308852272/history was/is pretty obviously a temporary structure. No source was given in the changeset that added it, so it's really not verifiable.
The natural objects changed seem to be way/1308852277/history and way/39253573 . The change involved adding one and adding an "intermittent" tag to the other. Given the nature of the water here, neither of those are likely fixed either.

Hello,
You've removed an access tag from way/143092566/history - how could you tell from aerial imagery?
Best Regards,
Andy

Great stuff - thanks!