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.
Pippa pronounces "ophthalmologist" differently every time she says it.