When Seb and Julia are drinking in the bar, the waitress never brings their drinks but they both suddenly have full drinks.
A laser microphone does not need a mirror, it reflects off the front of the glass, which is its primary advantage (it does not require access to a room to listen to it; if you had access you'd plant a bug). In fact, passing the laser through the window in both directions would likely cancel any information from sound wave vibrations.
The wireless printer would not have worked. Since Julia could not get it to work then it would have been turned off. The distance was too far and the wifi password was not known.
Pippa pronounces "ophthalmologist" differently every time she says it.