EAST RUTHERFORD, N.J. -- Five preseason games weren't enough for Eli Manning and the New York Giants' passing game to show anything, and they will go into the regular season still wondering about the state of their offense.

Manning was 1-for-4 in two series in Thursday's 16-13 victory over the Patriots. The Giants finished the preseason 5-0, but Manning finished the preseason 20-for-41 for 188 yards and one touchdown across the five games. The Giants have looked all right at times running the ball this summer, but overall the passing game has looked well out of sync and the new Ben McAdoo offense continues to look like a work in progress.

Here are some other thoughts on the Giants' final preseason game of the year:

• This game was wide receiver Mario Manningham's last chance to show he belonged on the roster after a disappointing preseason. Unfortunately for Manningham, he played only four plays before injuring his calf muscle. It's hard to imagine him and his creaky legs on the final roster.

• Henry Hynoski, however, was looking like a good bet to win the fullback job. But he had to leave Thursday's game with a shoulder injury. It's unclear how serious it is at this point, but Hynoski missed the bulk of the 2013 season with a shoulder injury, so it's a legitimate concern. John Conner would be his replacement.

• Preston Parker looks to be in line for one of those wide receiver spots with Manningham likely out of the picture and Marcus Harris already on injured reserve. Parker is helped by his ability as a return man, especially with Odell Beckham Jr. and Trindon Holliday out with hamstring injuries. Parker was the primary punt returner Thursday and even lined up to return a couple of kickoffs. It didn't help him, though, that he muffed a punt in the fourth quarter.

• Weston Richburg and John Jerry started at left guard and right guard, respectively, in place of the injured Geoff Schwartz and Brandon Mosley. Both played deep into the second half, long after the starting tackles and center J.D. Walton left the game. It's possible both will have to start the regular-season opener Sept. 8 in Detroit.

• Early-game defensive standouts included Jason Pierre-Paul, who batted down Jimmy Garoppolo's pass intended for new tight end Tim Wright on the game's first play, Stevie Brown, who tackled running back James White behind the line of scrimmage, and Zack Bowman, who would have had two interceptions if the first hadn't been called back for an illegal contact penalty.

• Tight end Adrien Robinson fumbled a ball away after a 17-yard reception at the end of the third quarter, underlining the troubling fact that neither he nor anyone else has separated himself from the uninspiring pack at tight end. Kellen Davis started the game Thursday, and Daniel Fells and Larry Donnell each had his moments, but the Giants are going to have to rotate these guys.