Filling

Hi, I’m a recent graduate and I just had an interview for an entry level role, so it was quite relaxed and I feel like I was suited towards my personality fit. But, at one point, the interviewer lost when train of thought and forgot what they were going to ask. Should I have filled in this space and said something like ‘let me tell me you my strengths’? Is this a common hidden technique in interviews or am I overthinking?