Unable to answer "What kind of building is this?" for way/822390258 via StreetComplete 55.0:

More than one building.

Unable to answer "Is there a bench at this stop?" for node/6248422966 via StreetComplete 53.0:

There's a bus stop to the west but not here.

Many trails to be mapped. Here is the park's map. https://charltonparkorg.presencehost.net/file_download/inline/5c75da21-4da9-49e0-99bb-aa3a31449174

Unable to answer "Does this road have lane markings?" – Residential Road – way/789774190 via StreetComplete 62.2:

This is in a parking lot, it is not a residential road.

Unable to answer "How are the footpath and bicycle path laid out here?" – Cycle Path – way/1190735334 via StreetComplete 58.2:

This is a multi-use path. Not a cycleway. Very likely, foot traffic even has the right of way. See the Michigan wiki for more information.
osm.wiki/Michigan

The offset must have been off on the imagery used to trace these buildings.

This trail seemed to no longer be getting mowed. See Mapillary photos.

#OsmAnd

The trail segment here must no longer be getting mowed. See Mapillary photos.

#OsmAnd

Unable to answer "What kind of parking is this?" – Wintergarden Valet (Park & Ride Lot) – node/10899449712 via StreetComplete 61.3:

Not sure how this should be tagged. This is inside the Renaissance Center, just northeast of the office for a valet service. Not a parking lot.

Unable to answer "Is this building completely underground?" – Restroom – way/107230550 via StreetComplete 61.3:

It is not underground at all. See Mapillary photos.