Playfield:
Register  Block  Pixel  CPU
PF0       0      68     22
PF0       1      72     24
PF0       2      76     25
PF0       3      80     26
PF1       4      84     28
PF1       5      88     29
PF1       6      92     30
PF1       7      96     32
PF1       8      100    33
PF1       9      104    34
PF1       10     108    36
PF1       11     112    37
PF2       12     116    38
PF2       13     120    40
PF2       14     124    41
PF2       15     128    42
PF2       16     132    44
PF2       17     136    45
PF2       18     140    46
PF2       19     144    48
PF0       0      148    49
PF0       1      152    50
PF0       2      156    52
PF0       3      160    53
PF1       4      164    54
PF1       5      168    56
PF1       6      172    57
PF1       7      176    58
PF1       8      180    60
PF1       9      184    61
PF1       10     188    62
PF1       11     192    64
PF2       12     196    65
PF2       13     200    66
PF2       14     204    68
PF2       15     208    69
PF2       16     212    70
PF2       17     216    72
PF2       18     220    73
PF2       19     224    74

Debugger output from Adventure:

> u(row==214){s};q=t;u(row>214){p"time=",t-q," col=",col," bit=",(col-68)/4;l;s}
time=0 col=0 bit=-17
f099 84 1f    sty 0x1f; ENABL
time=3 col=9 bit=-15
f09b 86 1b    stx 0x1b; GRP0
time=6 col=18 bit=-13
f09d a4 8f    ldy 0x8f
time=9 col=27 bit=-11
f09f b1 80    lda (0x80), Y
time=14 col=42 bit=-7
f0a1 85 0d    sta 0xd; PF0
time=17 col=55 bit=-4
f0a3 c8       iny
time=19 col=57 bit=-3
f0a4 b1 80    lda (0x80), Y
time=24 col=72 bit=1
f0a6 85 0e    sta 0xe; PF1
time=27 col=85 bit=4 ; 4.25 really
f0a8 c8       iny
time=29 col=87 bit=4
f0a9 b1 80    lda (0x80), Y
time=34 col=102 bit=8
f0ab 85 0f    sta 0xf; PF2
time=37 col=115 bit=11
f0ad c8       iny
time=39 col=117 bit=12
f0ae 84 8f    sty 0x8f
time=42 col=126 bit=14
f0b0 c6 8e    dec 0x8e
time=47 col=141 bit=18
f0b2 a5 8e    lda 0x8e
time=50 col=150 bit=20
f0b4 c9 08    cmp #0x8
time=52 col=156 bit=22
f0b6 10 a7    BPL 0xf05f
time=55 col=165 bit=24
f05f a5 8e    lda 0x8e
time=58 col=174 bit=26
f061 38       SEC
time=60 col=180 bit=28
f062 e5 89    sbc 0x89
time=63 col=189 bit=30
f064 85 02    sta 0x2; WSYNC

By time we've executed that sta PF1 at F0A6 PF1 is already
being displayed. That explains the one pixel artifact I was
seeing.