What is the explanation for these bizarre JavaScript behaviours mentioned in the 'Wat' talk for CodeMash 2012?

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jQuery/JavaScript to replace broken images

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When should I use curly braces for ES6 import?

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Origin is not allowed by Access-Control-Allow-Origin

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JavaScript OR (||) variable assignment explanation

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c#type-hintingtostringangularjs-factorywindows-consolereact-routermaxpathasciiparentfragment-identifiercpu-architecturevariadic-functionscalling-conventionjquery-loadutf-8bootstrap-5dhtmlwarningsnpm-install