Tucked away among the keepsakes from Don McGatlin’s 47-year career as a high school football coach lies buried treasure. A 16-millimeter film — not a video, mind you, but an old-style film that coaches ran through a whirring projector back in the day — shows Bret, his 7-year-old son, racing up and down the sidelines at a Green Mountain football game. Clipboard in his tiny hands, Bret kept track of the exploits of Lance French, the Rams’ star running back who was the 1986 winner of The Denver Post’s Gold Helmet Award. “I didn’t even know Bret was charting the game,” the 71-year-old McGatlin recalled.