When Toronto's Eaton Centre was built in the 1970s, a pedestrian tunnel was constructed under the tracks outside the fare-paid areas, connecting the two separate concourses.

[3] On September 27, 1997, 23-year-old Charlene Minkowski was killed when she was pushed onto the tracks in front of an oncoming train at Dundas by Herbert Cheoung, a diagnosed schizophrenic.

[7] In December 2023, Toronto City Council passed a motion which directed the TTC board to rename the station by the fourth quarter of 2024.

Dundas is the only station in Toronto where the northbound and southbound platforms are in separate fare-paid areas, owing to the constrained space and difficult geology at this location.

Separate street entrances had to be used for each direction until the Eaton Centre was built, at which time a tunnel was constructed under the tracks outside the fare-paid areas, which is considered the third level.

The station features William McElcheran's Cross Section, located by the northwest entrance and along the under-platform crosswalk.