Last week, Crazy Ex-Girlfriend got lots of comedy out of Rebecca (Rachel Bloom) retreating from her woes by going home to mother – who, played by Tovah Feldshuh, was unusually supportive. Unusually and, as it turned out, deceptively, by slipping Rebecca mood-altering drugs without Rebecca’s knowledge. Rebecca found and stole the pills, left her mother, and, on the plane back home, swallowed them all in a suicide attempt before informing the flight attendant. Then, at episode’s end, came a public service message with a suicide hotline number, encouraging viewers who are depressed and potentially suicidal to seek help. It’s a much stronger tone than you’d expect from a CW musical comedy series – and this week’s episode will build on that, not avoid it.