High-resolution logos from generic or real-sounding clinics (e.g., "Metro Urgent Care & Wellness").
An "authentic" fake doctor's note for work often includes a feature. Fake Doctors Release Note For Work
Using variable stroke fonts to make the digital signature look like it was penned in a hurry. Fake Doctors Release Note For Work
Specific phrasing like "under my professional care" or "fit to return with restrictions," rather than just saying the person was sick. Fake Doctors Release Note For Work