When questioned about the murder, Felix Quintero adds a superhero twist to the expression "why on Earth" - he says "why on Earth-616", using the 'official' designation of the 'primary' universe in the Marvel Comics multiverse (as opposed to, for instance, Earth-1610 aka the Ultimate universe).
In "Baltimore," it is revealed that Wendy, Tony's ex-fiancée, was his high school music teacher, implying she is older than him. However, Perrey Reeves, who plays Wendy, is 2 years younger than Michael Weatherly, who plays Tony.