I'm recommending Point-of-View practice when it smells between PO and Scrum Team in my Scrum trainings. This is a small activity which enables better understanding of each others problems faced in working and helps better collabration.
It was introduced by Craig Larman when he was coaching my previous team. I was inspired by his view point to Sprint review that it is NOT just a demo of done Sprint Backlog items to Product Owner but also a great oppertunity to inspect and adapt by Scrum team and PO as a whole.
When Scrum Master feels there's a smell between PO and team's collabration, he/she can initialize this activity: team writes own pains faced during the Sprint, and also writes PO's pains team can see/imagine. PO also does the same. After all finished, we paste these post-its on board and everybody can see. This encourages each other to speak out the impediments behind, bring underwater things up then PO and the Scrum team can solve as a whole. This also enables better understanding our each other's work, as a result the trust level could be increased as well.
Looking back to Agile&Scrum ideas, this can help for better "inspecting and adapting" and "collabration with customer".