SDFI-kortene påstår, at vandløbet hedder "Ellerende".
Er "Færgerende" måske navnet på dalen, som vandløbet løber igennem?

There is something wrong with the "Køge Å" waterway relation.
relation/13036288

All of Slimminge Å has been made part of it, but the segment of Køge Å to the west of this Note has not been.

Both the water from the northeast and southeast have been named "Tingsted Å".

Siden
https://www.knuthenborg.dk/da/dyrene/afrikansk-loeve
antyder, at der to adskildte grupper tigre.

Hegnet ser ikke ud til at være tegnet helt færdigt, og det er ikke angivet, hvordan sporene går igennem de indre dele af hegnet.

This forest track is thoroughly blocked by lumber right here. Much of the area to the southeast has signs restricting access due to fowl being released.

Access to the forest from the west is no longer through the estate track, but through the farm-related track just north of it.

I'm not sure how to mark any of this on OSM, though...

A number of Tags have been put on the Line
way/1314066938/history
instead of on an Area.

The associated schoolgrounds multipolygon Relation
relation/18019595/history
covers schools all over Zealand. It might go against the "Relations are not categories" principle.

There is a weird construction here. Presumably, it aids in sea navigation, but what is it and what is it called?

There is something wrong with the forest part of the Rismosevej track.
I couldn't find the track shown on OSM, and drove along the most obvious track instead which was not even on the map.
(Be warned: It's not a very pleasant track for biking.)

I wonder about those addresses and buildings too...

Compare with my GPS trace:
@cyclist789/traces/11488138

This (northwestern) part looks completely overgrown to me. I couldn't even tell where it used to be when I stood there recently.