First name, last name, company and job title appear on the e-ticket by default. You can decide to show other details from the registration form on the e-ticket (eg. workshop choice):
Go to the Ticket Module, Entry tickets.
Click the pencil icon behind the appropriate e-ticket.
Choose 'Show extra fields on e-ticket'.
You can now select all fields you want to include.
The details appear in the right bottom corner of the ticket. You can include 10 extra fields in the e-ticket.