In "Taking Sides,"scripted by Hugh Wedlock, Jr., Ellen and Scott Desmond (Diana Canova and Bob Urich), and Gladys and Max Watkins (Audrey Meadows and Robert Mandan) play couples who seemingly have one thing in common: their "testy" marriages. Wendel and Ida Snead (Harry Morgan and Priscilla Morrill) are a pleasant older couple en route to Mexico for a visit with their grandchildren. Unbeknown to Ida, Wendel is paying for the expensive trip by cheating at cards in "A Friendly Little Game," written by Ray Brenner. Sheila Lawrence (Georgia Engel) has been sent to sea by her protective papa (Herb Voland), who has asked Doc Bricker to guard the young woman's virtue. But soon after the ship leaves the shore, Sheila is off and running into the arms of Howard Wilson (Harvey Jason), who is unable to operate without a lover's manual in "Going by the Book," written by Jerry Winnick.