After listening to this podcast it sounds like,
@flynnic, that you should name doctors you shadowed, for example, to lend credibility to your activity.
But make it short, like "Observing pediatrician Dr. Cool in his clinic showed me....." (55 characters)
rather than
"I shadowed Dr. Cool, who is a general pediatrician, in his outpatient clinic. From this experience I was able to learn..." (118 characters)
The AMCAS app definitely asks for contact info such as an email or phone number, but the TMDSAS app does not
The drop-down info before your description will include title of activity, city & state, start & end date, and number of hours.
In the Employment category you can also enter your employer, so if you are scribing in person, for example, you could get the name of the doctor in that way without using up characters in the description.