During its early days, the 210 diverted off the Long Mile Road to run by Superquinn on Walkinstown Road and also operated via Corkagh Park on Sundays.
I have seen pictures of the 210 outside the Coombe Hospital. It turned around on a piece of wasteground there where cars sometimes parked, but that was when it was minibus operated. When it was converted to standard single decker, then it was extended to Kevin Street as an official terminus.
The turning point at Dolphin's Barn was only used after it had been cut back from the city centre.
The 210 was re-routed to Tallaght after it was partially replaced by the 151. The residents of Bawnogue were happy to use the new 210, giving them a link to Tallaght which they had not seen since the 74A was cancelled. Over the past few years I have heard residents groups there trying to lobby politicians to re-instate a link to Tallaght, but nothing has come of it.