I think Past Perfect should be used in both cases, for otherwise you'll have only one of the subordinate clauses tense-shifted.
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OlgaaIf yes, won't the latter variant mean that "arrived" and "noticed" took place at the same time?No, because of the before. Nick noticed [this] before we arrived is quite clear enough. To make the noticing the prior event, you'd have Nick had noticed this before we arrived, but that is really excessive and unnecessary, in my op