The print on Phillip Price (Michael Cristofer)'s wall is the 1914 assassination of Archduke Franz Ferdinand of Austria by a Yugoslav nationalist at Sarajevo, which triggered World War I.
Deleted Scenes: At Fidelio's, after they toast, a man and woman dressed well in fsociety masks enter and sit at a nearby table. They pretend to eat food from McDonalds, causing visible irritation at the E Corp table. The concierge returns and threatens to call the police again. The man puts a bag with a giant dollar bill sign on the table. The concierge reiterates that they need to leave and they do with mock annoyance. She apologises to Price (Michael Cristofer), who asks for the fries and get a laugh from the table.
Elliot (Rami Malek) takes adderall to get rid of Mr. Robot (Christian Slater). Adderall is a stimulant generally prescribed to treat ADHD. It improves attention and wakefulness, but in larger doses, side effects include euphoria, insomnia, hallucinations and paranoia. Elliot takes up to 200mg; the maximum therapeutic dose for adults is 40mg.
Romero (Ron Cephas Jones)'s PC was likely ignited by thermite trap that triggered when FBI agents tried to access his computer. Thermite is a pyrotechnic that burns at high temperatures to melt the metal plates or silicon chips in hard drives.
FBI agent Dominique DiPierro (Grace Gummer) exchanges IRC messages with HappyHardonHenry806, a likely reference to Christian Slater alias Happy Harry Hardon in Pump Up the Volume (1990).