Both of the Eleventh Doctor's coats and the Tenth Doctor's trenchcoat are visible when Clara steals the TARDIS keys.
At a Royal Television Society event, Steven Moffat revealed a decoy version of Missy's reveal in the episode was shot in case any members of the public overheard: "You know who I am. I'm Missy. Or, if you'd prefer, Random Access Neural Integrator. Rani for short." For the version actually used in the finished programme, Peter Capaldi and Michelle Gomez mouthed their dialogue, which would be added in dubbing.
The shape of the logo for 3W, used throughout this episode and Death in Heaven (2014), is implied to represent the Nethersphere (a large circle with a small circle offset to the lower-left). It actually also echoes the shape of the Cybermen's eyes in this current iteration. It is most obvious when the Doctor leaves the office with Dr Chang, just after telling Clara, "I feel like I'm missing something obvious": he exits sliding double-doors with windows shaped like the 3W logo, set in opposite orientations, so when the doors come together the windows appear like the eye-pods of the Cyber-helmets.
The Hyperscape Body Swap Ticket used to get Clara and the Eleventh Doctor into Doctor Who at the Proms (2013) is shown on Clara's bookshelf among her sticky notes. Discounting the sticky note references to the Paternoster Gang, whom Clara had also encountered in Series 7, and one reading "Impossible Girl" (which was a plot element in Deep Breath (2014)), the ticket is the only item exclusive to the Eleventh Doctor era visible on Clara's notes, though the camera does not focus in on all the stickies.