Stream is named "River Poddle / Whitestown Stream" and "Tallaght Stream". I don't think it can be part of the Poddle, which is further north.

How should this little building/extension at the back be mapped/tagged? Which building does it belong to?

Unable to answer "What kind of parking is this?" for way/490691677 via StreetComplete 30.1:

there doesn't appear to be parking here... there are double yellow lines

Attached photo(s):
https://westnordost.de/p/32127.jpg

House numbers need to be checked and re-done for all of Gainsborough.

I just came across this area via maproulette http://maproulette.org/map/1473/1582265 But the data round here looks a long way off from where bing is showing stuff. I guess it's mapping based entirely on wonky GPS traces

"Long derelict; the building has now been rebuilt and is a private residence."
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2025-02-27T10:33:49Z
POI name: The Jackpot
POI types: shop-convenience
#organicmaps android

Possible Luas substation.

The place doesn’t exist anymore

Business name: Kumon Carrick-on-Shannon Study Centre

Market Yard Centre
Carrick-on-Shannon,Co. Leitrim
071 9645522
http://www.kumon.ie/Carrick-on-Shannon/index.htm

The Kumon maths and English study programmes enable students of all ages and abilities to achieve. Our aim is for each and every child to become an independent, advanced learner, with a positive attitude to study.

Road is one way (since 2019)