'Now that you mention it' refers to the previous sentence: she mentions that 'he looks just like her'. 'Put (something) together' = make a deduction from 2 pieces of information.
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Mister Micawber'Now that you mention it' refers to the previous sentence: she mentions that 'he looks just like her'.but I don't know the function of this red part here, I mean what is its role in completing the concept of the whole sentence. Wouldn't the meaning be
'Put (something) together' = make a deduction from 2 pieces of information.
Mister MicawberIt is a discourse marker, tying the conversation together.Thanks a lot.