Romeo and Juliet--Although Franco Zeffirelli's teen-age treatment of Shake-speare's situation tragedy may be some what free-wheeling for all tastes, sentimentalists will eat up every second. Olivia Hussey's reading of Juliet proves a truly right interpretation of the part. At the ABBEY, 600 Commonwealth Ave. (262-1303).
Shalako--A mildly entertaining Western sorely in need of a good gag-writer and Brigitte Bardot. Luckily they got Bardot. At the PARAMOUNT, Washington St. across from Raymond's (482-4820).
Star--Despite wonderful music, ranging from Kurt Weill to Cole Porter, an aimless, fruitless movie. The theatrical history, however, is fun, and Julie Andrews and Daniel Massey are likewise as Gertrude Lawrence and Noel Coward. At the GARY, 131 Stuart (542-7040).
The Man from Rio--The incomparable Jean-Paul Belmondo becomes the first screen hero ever to kick a bad guy in the groin. If you like slapstick and involved plots, hop to it. At the SYMPHONY I, Huntington at Mass. Ave.(262-8837).
2001--Stanley Kubrick's epic of human advancement, externally motivated. The special effects must be seen, and can best be seen from the first five rows. At the CINERAMA, Washington Street near Essex (482-4515).
The Vixens--First "Therese and Isabelle" made "The Fox" look a milkfed puppy. Now this film claims to make "I, a Woman" look like "Heidi." Take it from there. At the WEST END CINEMA, North Station (523-4050).
West Side Story--Much, much worse than the show. Badly dubbed and drippily sung, but funny in places. At the SAVOY, 163 Tremont (536-2120).
Yellow Submarine--A good cartoon about the Beatles not to be confused either with The Road Runner or Joyce's Ulysses. The drawing leans overly on contemporary advertising art, but the 85 minutes are provocative and occasionally moving. At the BEACON HILL, Tremont between Beacon St. & ovt. Center (227-6676).