No it looks like his helmet but he is not back after the drama of last year (neither is Rene Arnoux), it is Claudia Hurtgen or "John of B" https://acm.mc/en/edition/13e-grand-prix-de-monaco-historique/event/races-entries/
this was leclerc in monaco during the historian/oldtimer GP buit he could drive the car back to the boxes
No, not to the boxes, he somehow missed the entrance to the boxes and parked it in the start/finishing lane. He must have been a bit shaken or confused. Marcel Massini
The plan, since this was a demo run, different from a practice session or a race, was for Ickx and Charles to stop on the finish line for applause and to say a few words with a commentator on the PA system like Jacky did but Charles stopped a few hundred meters early because he realized from what he was hearing and feeling in the car that driving it further would cause further damage.