The prison which Agent Dunham goes to in Germany is called Wissenschaft Prison. Wissenschaft is the German word for science.
The word that the glyphs translate to is "Codes".
A pale bald man known as "The Observer" can be seen in the terminal at the Frankfurt Main airport at 16:08.
Walter calling Astrid by the wrong name: Astro and Asteroid.
During Loeb's debrief at the beginning of the episode, Broyles asks him what "Other agents [are] on the operation." Loeb answers "Coscarelli and Scrimm".
Don Coscarelli wrote/directed the "Phantasm" horror movies series, starring Angus Scrimm as the main villain.