Georges pulls over to read a sign on a pole over the road. However, the writing is on the north side of the sign; he stops south of it and could not read it. The writing on the north of the sign is on the wrong side of the highway, as it's above the highway 101 north lanes, and it would not be visible from the opposite, southbound lanes.
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Azusa, CA is 139 miles from Tijuana (a border city). Today, it takes over two hours to get there, but before the interstates, it took much longer. (Avoiding highways, Google says it would take over five hours.) Los Angeles is only 24 miles away. It was settled by Spain and was part of Mexico until 1850. If she wanted to take the children to see a "Mexican Fiesta", she could have taken the children there or, at maximum, to San Diego, which doesn't require crossing an international border.
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When Anita is sitting on Georges' lap at the typewriter, a moving shadow of the boom microphone can be seen in the mirror behind them.
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