Trivia: Since episode 10 of season 2, "Nor I, Nigel AKA Leg in Iron", all the episode names (at least to episode 21) are palindromes (a word or phase spelled the same forward or backwards).
Bishop73
3rd May 2017
Blindspot (2015)
3rd May 2017
Blindspot (2015)
Regard a Mere Mad Rager - S2-E19
Trivia: Even though simply opening the door is the solution, the math problem given yields an imaginary number. In the problem "boing" equals -1 and "flarp" equals 2. Then it asks what is the square root of -1 over 2. It's impossible to get the square root of a negative number since any number times itself yields a positive number.
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Suggested correction: Using complex numbers, the (square root of -1/2) = (1 over the square root of 2 times i).
The square root in the denominator is not considered to be in simplest form. Therefore, the answer is actually the (square root of 2) over 2 times i.