Want to flummox the Japanese tongue? Try a sentence like "Darth Vader is Luke's father". It hits most of the highlights: interdentals, labiodentals, and that weird 'r' sound English has that Japanese sometimes tend to conflate with 'l'. Even a competent Japanese English speaker is likely to render it as "Dāsu Bēdā izu Rūkusu fazā". Depending on the region they may mess up the 'f'; the syllable 'fu' is actually 'hu', but pronounced with very pursed lips in Tokyo Japanese (not so much in Kansai).

Unless they're bilingual from childhood, most people are not able to pronounce sounds outside their milk tongue without difficulty. That you expect English sounds to be perfectly pronounceable by non-English-speakers is probably more reflective of the fact that quality English education is widely available where you live than anything.