At least this brownie explains Walden's behavior. It's not baked with the usual ingrdients.
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Berta goes on vacation, forcing Charlie to get a replacement on Two and a Half Men.
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Berta sits down to talk with television producer Marty Pepper (Carl Reiner).
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Charlie and Berta sit down on the couch to watch some television and relax while Alan cooks.
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Evelyn and Berta talk to legendary television producer Marty Pepper (guest star Carl Reiner).
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When Chelsea and Alan, the best of friends, are busy cooking dinner, Charlie and Berta analyze the situation over some beers outside.
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When Chelsea moves in, Berta informs Charlie that she now works for Chelsea and he can direct his requests through her.
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Charlie helps catch Berta up on all the events that happened the the previous day... such as Rose and Alan going on a double date with him and Chelsea. Wait... what?
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Two and a Half Men Quotes

Judith: Don't you think you've had enough to drink at the magic show, Evelyn?
Evelyn: Excuse me, darling, but some of us deal with our boredom and depression the old-fashioned, non-prescription way

Evelyn: I'm deeply hurt.
Alan: With me or Charlie?
Evelyn: Charlie.
Alan: Great, come on in