During Cappelletti's pro career, he also returned punts and kickoffs, played defensive back and even had one pass completion for a touchdown. Cappelletti was just the second AFL player to record three interceptions (of Tom Flores) in a regular-season game, holds the professional football record for most touchdowns in Saturday games (10), scored 18 points or more in a game ten times and scored 20 or more points in a game eight times. He set the AFL single-game record by scoring 28 points in the Patriots' 42–14 rout of Houston on December 18, 1965. Cappelletti is the only player in professional football history to run for a two-point conversion, throw for a two-point conversion, catch a pass, intercept a pass, return a punt and return a kickoff in the same season. He kicked six field goals (without a miss) in a 39–10 win at Denver on October 4, 1964, and became one of only two AFL kickers with at least four field goals per game for three consecutive games. Cappelletti kicked the longest field goal in the AFL in consecutive seasons and led the AFL in field-goal percentage in 1965.