The 6-foot-4, 200-pound Callinan received the full treatment during his lengthy visit, which began in the early morning and didn't end until well after lunch.
"It definitely was impressive," said Callinan, who was verbally offered by Rutgers two months ago. "That's the first time I saw something like that. It was very nice."
On prior trips, Callinan saw practices and toured the Hale Center, but they weren't conducive to building relationships and being able to ask a lot of questions.
The times, Callinan's day included meetings and discussions with the offensive staff, and he spent much of the time with receivers coach P.J. Fleck. He also had lunch at the Grease Trucks, and got a feel for what the coaching staff is like off the field.
"I spent the whole day with (Fleck)," Callinan said. "We talked about my future, and how the offense work, how I would fit into the offense. It was really good."
Being able to see the coaching staff in a different way, and what he learned is the Scarlet Knights' staff meshes with his thoughts on what a college staff should be.
"If I go to a school, any random school, the coaches are going to be on the field be straightforward, so when they tell you, you're going to have to do it," Callinan said. "You can't joke or anything, which is good, but there's no reason to be like that off the field. It wouldn't be a good environment to be around, it would be stressful."
Because of the high number of prospects St. Peter's Prep churns out annually, plenty of schools learned about Callinan this spring, including Penn State, Boston College, Connecticut, Miami, North Carolina and Oregon.
And while he and his teammates are focused on winning an elusive state title, which will keep him away from many camps, he could be at Rutgers a few times in the coming weeks.
St. Peter's Prep is playing in next Saturday's 7-on-7 Schiano Shootout, and Callinan is also thinking about camping a few days later.
"Coach Fleck said if I go, he would be counseling there, and he told me I could see what it would be like if I were to go to Rutgers," Callinan said. "He said he would take me through all the drills, and he'll help me out a lot."