Interrupting politely
Excuse me,
Pardon me,
May I interrupt (for a minute)?
Can I add something here?
I don’t mean to intrude, but . . .
Could I inject something here?
Do you mind if I jump in here?
Getting back to the topic
Anyway,
Now, where was I?
Where were we?
What were you saying?
You were saying . . .
To get back to . . .