ping error

Got this while pinging Google DNS from my mifi:

64 bytes from 8.8.8.8: icmp_req=302 ttl=50 time=2095 ms
64 bytes from 8.8.8.8: icmp_req=303 ttl=50 time=2107 ms
wrong data byte #52 should be 0x34 but was 0x45
#8      8 9 a b c d e f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25 26 27
#40     28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 45 0 0 54
64 bytes from 8.8.8.8: icmp_req=305 ttl=50 time=2127 ms
64 bytes from 8.8.8.8: icmp_req=316 ttl=50 time=11091 ms
64 bytes from 8.8.8.8: icmp_req=317 ttl=50 time=10083 ms

Interesting to me that i) ping is doing more checking than I thought, and ii) there are link layers around that corrupt data (rather than drop packets) in reality not just theory.