was useful for me for learning to recognize the tones. You can practice your listening skills doing the following exercise. You have to press Play and you will hear a word (you can repeat as many times you want) and you have to choose which tone you heard. Then, it will show in the ...
In fact, as @dROOOze mentioned, two of them have phonetic indicators. But they won't help you at all.
施's phonetic indicator is 也(ye3). You may wonder why?! I'd say that 也 contributes to 施's uncommon sounds yi2/yi4.
旋's phonetic indicator is 疋(pi3/ya3/shu1). Again, you can't relate them. In fact, from the Kangxi dictionary, you can find that 疋 has been ...
The article is exaggerating the sound change for humorous effect.
驾驶 would easily get elided into something like jiàr in fast speech, but it would never become nasalized to jiàng.
证 would indeed become zhèngr (which is pronounced like a nasalized zhèr) due to 儿化音, but it would never undergo the tone and vowel change to become zhīr.