This Neil Simon film feels uneven, presenting stories of four families whose paths cross while staying at the Beverly Hills Hotel. One family, the Warrens—Jane Fonda and Alan Alda—are dealing with their teenage daughter's desire to spend more time with her father, which creates uncertainty and tension for the mother who has custody. Walter Matthau plays "Marvin," arriving before his wife, Elaine May’s “Millie,” and e…